Martian Micro-Magnets
NASA Science

The case for ancient life on Mars looks better than ever after scientists announced last week that they had discovered magnetic crystals inside a Martian meteorite — crystals that, here on Earth, are produced only by microscopic life forms. Scientists studying the Allan Hills meteorite, a 4-billion-year-old rock from Mars that landed in Antarctica about 13,000 years ago, found just such crystals deep inside the space rock.